Dodge Q&A

1994 Dodge Dakota Question: front cyls,. not firing

i replaced the timing chain onmy94 dakota magnum v8(5.2L--318).it fires right up every time but cyls. 1,3,4,and 6 are not firing. i checked the wires and im getting spark but the cyls. are not firing...it puzzles me that the front 4 cyls are not firing but the back 4 are. do i need to have the computer reset??